To find the diameter in mm of a Japanese knitting needle, you multiply the size by 0.3 and add 2.1.
What is the diameter in mm of a size 5 Japanese knitting needle?
Select one option, then click Submit.
3.6
7.4
10.8
12
17.1
Select an option, then submit.
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Intermediate Mathematical Challenge 2011 (2011)
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